Electrically-controlled door-lock.



G. WRIGHT. ELECTRICALLY GGNTBOLLED DOOR LOCK.

APPLICATION FILED JAN.31, 1913. y

Patented May 19, 1914,

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GILBERT WRIGHT, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC A COMPANY, A CORPORATION OF NEW YORK.

ELECTRICALLY-CONTROLLED DOOR-LOCK.

Specification of Letters Patent.

Patented May 19, 1914.

Application led January 31, 1913. Serial No. 745,421.

T 0 all whom, it may concerny Be it known that I, GILBERT WRIGHT, a citizen ofthe United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electrically- Controlled Door-Locks, of which the following is a specification.

My inventlon relates to electrically controlled door locks and has for its object an improvement in such devices.

In hotels and the like, where electric lights and other electrical devices are employed, it has been found that frequently the occupants of the rooms will leave the same without turning oft" the lights or other devices which ma cuit and t ius occasion considerable waste of electric energy.

The object of my invention is the construction of a simple form of electrically con-- trolled door lock ot such a nature that it is impossible for the door to be locked from the outside unless such lights or other electric devices have previously been turned ott.

I accomplish the object of my invention by the use of a. special form ofpdoor lock with an electro-magnetic catch of such a character that the bolt of the lock cannot be actuated or shot to lock the door unless the current has been turned ofi' from the lights or other translating devices in the room.

I am aware that a number of electric locks have been proposed of such a character thatwhen the lock-bolt is actuated, the lights are turned oli", and I am also aware that a number of electric. locks have been proposed of such a character that the lockholt is withdrawn by lneans ofsuitable electromagnets, but I am not lavare that any form of lock has been proposed similar to that which forms the object of the present invention.

For a further understanding of my invention, reference may be had to the accompanying drawing which shows, partly in section and partly diagrammatically, a form in which my invention may be carried out.

1 represents, in section, a portion of the door and 2, in section, a portion of the door jamb, although it will be understood that these two members may, if desired, be transposed.

3 shows a portion of the lock which is attached to the door by means of screws 4,

be connected to the electric cirthrough a hole 18 in catch 9.

and 5 shows the portion of the lock or strike plate which may be attached to the jamb by screws 6 in the manne'r well understood by those skilled in the art.

7 represents a portion of the lock-bolt, which may be of any suitable construction and actuated in the usual manner by a key or other actuating device. When the lockboltl 7 is shot forward, it will engage in the well known manner in a recess in the portion 5 of the lock, which recess has in operative relation with it a shutter 8 which is adapted in one position, such as the one shown in full lines, to prevent the entrance of the boltinto the recess. In operative relation with the shutter 8 is a catch 9, whichI have shown as composed of magnetic material and free to rock on a. pivot 10 on an electromagnet composed of a core 11 and a coil 12 which is a pin 17, whose other end passes loosely Surrounding pin 1t, 1s a spring 1f), one end of which is in engagement with shutter S and the other cnd with catch 9.

The operation of in v device will be as follows: llhcn the electric circuit .supplying the lamps, or other translating devices, is closed. that is thcfswitch 1G is turned to the on position. as shownt the elcctromaflnct will pull down thc catch into the. position shown in full lines against the action ot spring 1S) and into engagement with shutter S, preventing any motion of the shutter to the left. It au attempt he then made to actuate the lock-bolt 7 to lock the door, this will be found to be impossible, as the movement of the. lock-bolt will be prevented by the shutter 8, which is restrained in its p reventive position by catch 9. In orde'i` then to lock the door, it will be necessary to turn the switch 16 into the oil position, in which case., as the catch 9 will no longer be attracted to its closed position bythe electromagnet, since the latter is now dcnergized, duo to the action of spring 19, it will be rocked to an open position, shown by the dotted lines, and will thus allow movement of the shutter,` which, however, is kept normally, through the action of spring 19, in the position shown by the full lines in the ligure, as will readily be seen. If now it is desired to actuate the lock-bolt or to lock the door, this may readily be done, the shutter 8 moving inward toward the left against the action of the spring and into the position shown in the dotted lines and thus allowing the lock-bolt to enter into engagement with the recess in ortion 5 of the lock. It will thus be possible only 'toactuate the lock-bolt tolock the door-when the lampsv or other devices have been turned otl" and the electromagnet, therefore, denergized, and impossible to actuate the llock-bolt when the circuit is energized.

lVhile'I have described a preferred embodiment of my invention, I do not limit myself to this embodiment but seek in the appended claims to cover all embodiments which shall be within the scope and not depart from the spirit of my invention.

lVhat I claim as new and desire to secure by Letters Patent of the United States, isr- 1. In combination, an electric circuit, a lock comprising a lock-bolt and a strikeplate adapted 1o be entered by said bolt, and means for preventing such entrance When the circuit is energized. i

2. In combination, an electric circuit, a lock comprising a lock-bolt, a member adapted to be, engaged thereby, a movable shutter adapted in one position to prevent such engagement, and means in operative relation with the shutter to keep it in the said position when the circuit is energized.

3. In combination, an electric circuit, a lock comprising a lock-bolt, a member adapted to be engaged thereby, a` movable shutter adapted normally to allow such engagement but in one position to prevent the same, and means in operative relation with the shutter to keep it in its preventive position when the circuit is energized.

4. In combination, an electrical circuit, a lock comprising a lockbolt, a member having a recess adapted to be engaged thereby, a movable shutter in operative relation with the bolt and the recess adapted in one position to prevent such engagement, a movable catch in operative relation with the shutter normally biased to an open position to allow movement Vof the shutter and in its closed position preventing such movement, and an electromagnet connected to the circuit Vand in operative relation with the catch adapted when energized to hold the catch in its closed position.

5. In combination, an electrical circuit, a lock comprising a lockbolt, a member having a recess adapted to be engaged thereby, a movablev shutter in operative relation with the bolt and the recess adapted in one position to prevent such engagement, a movable catch in operative relation with the shutter adapted in its closed position to prevent movement of the shutter and restrain it in its preventive position, a spring in operative relation With the catch normally biasing it to its open position, and an electromagnet connected to the circuit in operative relation with the catch adapted when energized to hold the catch in its closed position.

In witness whereof, I have hereunto set my hand this 28th day of January, 1913.

GILBERT WRIGHT. 

